My bad, I got mixoed up.
D mixo = G maj (ABCDEF#G)
D maj (ABC#DEF#G)
I flatted the wrong 7th becauase D mixo does not always equal G maj. The 7th in D mixo is the C not the F. This scale shit gives me a headache. I actually play it correctly just transcribe it wrong.

Only diff between a D maj and D mixo scale is the C vs C#. I like the C because the tune has a C and G chord, so I change my vote to D mixo. Sorry Kevo I shall never cast doubt your way again. Well maybe never.

By the way. Since the song has a D, C and G chord is it in the key G? I always considered in the key of D since the main part of the tune is in D.